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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-22-270-01) Hitachi Energy AFS660/AFS665
28 September 2022
AusCERT Security Bulletin Summary
Product: Hitachi Energy AFS660/AFS665
Operating System: Network Appliance
CVE Names: CVE-2020-6994
Comment: CVSS (Max): 9.8 CVE-2020-6994 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: ICS-CERT
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ICS Advisory (ICSA-22-270-01)
Hitachi Energy AFS660/AFS665
Original release date: September 27, 2022
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1. EXECUTIVE SUMMARY
o CVSS v3 9.8
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Hitachi Energy
o Equipment: AFS660/AFS665
o Vulnerability: Improper Input Validation
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to
overflow an internal buffer and fully compromise the target device.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Hitachi Energy reports this vulnerability affects the following AFS660/AFS665
o Releases 7.0.02 or prior
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER INPUT VALIDATION CWE-20
Improper parsing of URL arguments could allow an attacker to exploit this
vulnerability by crafting specially formed HTTP requests to overflow an
internal buffer. Successful exploitation could fully compromise the device.
CVE-2020-6994 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Energy
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Switzerland
Hitachi Energy reported this vulnerability to CISA.
Hitachi Energy recommends users update to 7.1.05 or later or apply mitigation
Hitachi Energy recommends the following security practices and firewall
configurations to protect process control networks from attacks originating
from outside the network:
o Physically protect process control systems from unauthorized direct access.
o Separate process control systems from the internet and other networks using
a firewall system with minimal open ports.
o Process control systems should not be used for internet surfing, instant
messaging, or email.
o Portable computers and removable storage media should be carefully scanned
for viruses before connecting to a control system.
For more information, see Hitachi Energy advisory 8DBD000122.
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability these vulnerabilities.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage at cisa.gov/ics . Several CISA products detailing cyber
defense best practices are available for reading and download, including
Improving Industrial Control Systems Cybersecurity with Defense-in-Depth
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage at cisa.gov/ics in the technical information paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Organizations observing suspected malicious activity should follow established
internal procedures and report findings to CISA for tracking and correlation
against other incidents.
No known public exploits specifically target this vulnerability. This
vulnerability is exploitable remotely. This vulnerability has a low attack
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
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